Air outlet for round duct



FIG. 1 is a perspective view of an air outlet for round duct showing my new design;

FIG. 2 is a top view thereof;

FIG. 3 is a left side view thereof, the right side being the same as the side shown;

FIG. 4 is a bottom view thereof; and

FIG. 5 is an end view thereof. 

The ornamental design for an air outlet for round duct, as shown and described. 